/Engine/Source/Editor/UnrealEd/Classes/Editor/EditorEngine.h
Executes each line of text in a file sequentially, as if each were a separate command
void ExecFile ( [UWorld](API\Runtime\Engine\Engine\UWorld) * InWorld, const TCHAR * InFilename, [FOutputDevice](API\Runtime\Core\Misc\FOutputDevice) & Ar )